Dating someone who has the same birthday as you casual dating dublin casual dating dublin
So it will be $\approx$ P(Same year) $\times$ P(Same day).
So if you had some good estimate of P(Same year), you can calculate the overall probability reasonably well.
The larger you cast the search, the more possible bases there are for finding coincidences.
Libra to Libra, Pisces to Pisces, you break it down around town chatting about childhood birthday parties, deliciously disgusting foods, and hometown habits that died hard. Meghan Markle's father has stayed silent since she gave birth hoping, in his own words, that becoming a mother would 'mellow' her and they could heal their rift.Finding out someone shares a birthday with you feels like stars aligning, hearts criss-crossing, and lives twisting and tangling together.Thus, a baseline estimate for sharing the same date of birth would be the above statistic divided by two (because it captures 2 years) for sharing the same year multiplied by the probability of sharing the same birthday: $$P(DOB_i=DOB_j)\approx \frac \times \frac = 0.00045$$ Or roughly 1 in 2200.As has been noted, both the shared year and shared birthday probabilities could be further refined based on additional information.
But of course, when we speak about coincidences there is a much wide domain of search.